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This question is highly arguable. I would look to notes/book for specific answer to answer this without argument, but you can argue a lot. Most of this region is Pierre Shale. Though "Top layer" would equate to soil, which is ambiguous. it is a mixture of Pierre shale detritus and organic material (what makes it essentially soil)... (if this is intro Geology this is still true, but look to your book for the answer because they don't want the real one). Soil, is not dirt, which is not detritus. If I haven't helped, Google those 3 and you can argue your case if it comes to that.

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Why is it harmful to waste the top layer of soil?

The top layer of soil is the most fertile layer. It is the best for growing crops.


What exsposed the soil of the great plains?

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What is the top layer of the soil?

Topsoil.


What is the top soil layer?

Topsoil.


What is the soil layer with the most parent material?

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What exposed the soil of the gret plains?

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